Fly ash is milled in two modes: with PNS superplasticizer and apart of it. • Presence of PNS prevents adverse agglomeration of the fly ash particles. • Pastes consisting fly ash milled with PNS exhibit enhanced rheological properies. • Evaluated influence of PNS and fly ash on hydration kinetics of the blended binder.
Through this study, the mechanical properties of fly ash blended cement pastes were reported, and the results showed that the incorporation of fly ash significantly influenced the microstructure and mechanical properties of calcium-silicate-hydrates gel.
Abstract This works aims to study the effect of partial substitution of ordinary Portland cement (OPC) by silica fume (SF) and fly ash (FA) on the physico-mechanical properties of the hardened OPC–FA–SF composite cement pastes. The OPC was partially replaced by 20% and 30% fly ash along with 5% and 10% silica fume.
The aims of this research were study the microstructures and mechanical properties for partial replacement of cement with Fly ash (FA) and kaolin waste (KW). Ordinary Portland cement were partially replaced with FA and KW in the range of 25-35% and 10-25% by weight of cement powder. The kaolin waste was ground for 180 minutes before using. The specimen was packing into an iron mold which .
The results showed that fiber reinforced concrete that included high fly ash volume achieved compressive and tensile strength values that are more than double those of concrete without fly ash. Values of other mechanical properties have also achieved significant increase due to fly ash addition.
An experimental investigation has been carried out to study the physical and mechanical property of high volume fly ash cement paste. Ordinary portland cement was replaced by 0, 20, 30, 40, 50, 60 and 70 % class F fly ash (by weight). Water- binder ratio in all mixture was kept constant at 0.3.
This paper presented mechanical properties of geopolymer paste with fly ash variation. Mechanical properties were assessed by compressive and setting time test. Fly ashes were obtained from three different places namely Paiton, PT Petro Kimia Gresik (PKG) and Fly Ash were sold in the local market of Malang.
Cement-fly ash pastes prepared with FA activated in DM behave similary to cement-fly ash pastes prepared with untreated FA. The paste prepared with FA activated in PBM induces an increase of heat flow, while activation in BM produces the most visible effect – heat flow up to 18 h of hydration remains almost equal to that of the reference.
This paper presents workability, compressive strength and microstructure for geopolymer pastes and mortars made of class C fly ash at mass ratios of water-to-fly ash from 0.30 to 0.35. Fluidity was in the range of 145–173 mm for pastes and 131–136 mm for mortars. The highest strengths of paste and mortar were 58 MPa and 85 MPa when they were cured at 70 °C for 24 h.
This study considers mechanical properties and microstructure of class C fly ash-based geopolymer paste and mortar. 2. Experimental Test 2.1. Materials Class C fly ash (CFA) used in this study was obtained from Harbin Acheng Suibao Thermoelectric Power Plant, China. Chemical composition of fly ash precursor is 48.2% SiO2, 18.4% Al2O3
Mechanical properties and microstructure of magnesia–fly ash pastes Article (PDF Available) in Road Materials and Pavement Design · February 2018 with 92 Reads How we measure 'reads'
Composites are widely used as a lightweight material in automotive, aerospace, transportation, wind turbines, and leisure industry. Different reinforcement materials are used in composites of which fly ash attracts the researchers as an important reinforcement due to its enhanced mechanical properties such as low density, improved ultimate tensile strength, toughness, compressive strength .
Temperature for geopolymerization of fly ash. Mechanical behaviour Sergio Apodaca-García, Susana P. Arredondo-Rea, José M. Gómez-Soberón, Jorge L. Almaral-Sánchez, Ramón Corral-Higuera Abstract— Alkali activation of fly ash (FA) is a chemical process which allows the transformation of the amorphous
Mechanical strength of alkali-activated paste prepared with ground or unground coal fly ash and cured for 20 h at 85°C. The starting ashes and reaction products were characterized by XRD, scanning electron microscopy (SEM/EDX) and NMR.
Although the alkali activation of fly ash (FA) has been well investigated, the composite application of multiple chemical activators has not been well…
This paper presents workability, compressive strength and microstructure for geopolymer pastes and mortars made of class C fly ash at mass ratios of water-to-fly ash from 0.30 to 0.35. Fluidity was in the range of 145–173 mm for pastes and 131–136 .
Fly ash or flue ash, also known as pulverised fuel ash in the United Kingdom, is a coal combustion product that is composed of the particulates (fine particles of burned fuel) that are driven out of coal-fired boilers together with the flue gases.Ash that falls to the bottom of the boiler's combustion chamber (commonly called a firebox) is called bottom ash.
Abstract: This paper aimed to report the effects of fly ash (FA) on the mechanical properties and hydration of calcium sulfoaluminate-activated supersulfated cement (CSA-SSC). The CSA-SSC comprises of 80% granulated blast furnace slag (GBFS), 15% anhydrite, and 5% high-belite calcium sulfoaluminate cement (HB-CSA) clinker.
Cemented paste backfill containing coal gangue and fly ash (CGFACPB) is an emerging backfill technique for coal mines that allows environmentally hazardous coal gangue and fly ash to be reused in the underground goaf. Meanwhile, CGFACPB can provide an efficient ground support and reduce the surface subsidence. Due to the difference of consolidation environment between the laboratory and the .
poured into fly ash and again mixed until homogenous paste was obtained. Geopolymer paste was cast into steel molds and cured at 120°C for 6, 15 and 24 hours. Experimental procedure is given in Fig. 1.The authors of the accepted manuscripts will be given a copyright form and the form should accompany your final submission. Fig. 1.
This paper presents workability, compressive strength and microstructure for geopolymer pastes and mortars made of class C fly ash at mass ratios of water-to-fly ash from 0.30 to 0.35. Fluidity was in the range of 145-173 mm for pastes and 131-136 mm for mortars.
The tunnel muck has a great potential to be used as a recyclable engineering material in transit and other civil work projects instead of being deposited as construction waste. In this work, the geopolymer is generated by alkali-activated fly ashes, which act as cementitious materials to strengthen the tunnel muck. The tunnel muck has to be dehydrated, grinded, and screened before being .
Through this study, the microstructure and mechanical properties of fly ash blended cement paste at different water to cement ratios were quantitatively studied and linked to build a scientific basis for future study on concrete and other cementitious composites incorporating fly ash.